Samsung Galaxy Z Fold user uncovers the reason why hinges aren't unfolding flat

Foldable phones have been plagued with issues, and some won't show up until you've used them for a while. Now, it looks like the Samsung Galaxy Z Fold 4 might be having trouble opening flat.

source https://www.androidcentral.com/phones/samsung-galaxy-z-fold-user-discovers-debris-inside-hinge